I've seen pay become transparent (usually by accident) a few times and I've never once seen your scenario happen. If it even did I'm not sure why it would matter.
The most normal "outrage" response I've seen is "Bob makes more than Alice even though Bob is less productive".
Usually with pay secrecy the employer is covering for the fact that Bob had more leverage when negotiating salary and even though Bob is a profitable employee that they want to keep, Alice is a very profitable employee because she's cheap.
If Alice is no longer kept in the dark, she has both additional leverage and an incentive to leave in a fit of pique, neither of which you want for your most profitable employees.
Eventually you’d have to leave or the boss would have to ditch pay transparency.
There is no world where 10X people will agree to a 50-75% pay cut, so the only people that will be left in these transparent shops will be the bottom half of the talent pool.